let xPos = 0;

let delay = 500;

let nextDotTime = 0;

​

​

function setup() {

  createCanvas(400, 400);

  background(0);

  fill('violet');

  frameRate(60)

}

​

function draw() {

  let currentTime = millis();

  for (yPos = 30; yPos < height; yPos=yPos + 40) {

    for (xPos = 20; xPos<width; xPos=xPos + 40) {

      circle(xPos,yPos, 5);

    }

  }

}